Hmmm, I guess that CRC failures indeed indicate noise. 
However, LoRa does not require CRC to be enabled. But LoRaWAN does, for uplinks (just like it requires specific other LoRa-settings, such as a coding rate of 4/5.)
So, CRC-less LoRa exists as well. Now, would a gateway recognize/reject a CRC-less LoRa packet…? Maybe that’s covered in Phantom Packets, which I remember being a nice read anyhow. A teaser quote and image:
If that is the case how can it be that the CRC is valid for about 70% of the phantom packets?
